S3C94A5 Datasheet, PDF (202/246 Pages) Samsung semiconductor – 8-BIT CMOS MICROCONTROLLER

WATCH TIMER
S3C94A5/F94A5
WATCH TIMER CONTROL REGISTER (WTCON)
The watch timer control register, WTCON is used to select the input clock source, the watch timer interrupt time and
Buzzer signal, to enable or disable the watch timer function. It is located in page 0 at address DAH, and is
read/write addressable using register addressing mode.
A reset clears WTCON to "00H". This disable the watch timer.
So, if you want to use the watch timer, you must write appropriate value to WTCON.
Watch Timer Control Register (WTCON)
DAH, R/W
MSB .7 .6 .5 .4 .3 .2 .1 .0 LSB
Not used
Not used
Watch timer INT Enable/Disable bit:
0 = Disable watch timer INT
1 = Enable watch timer INT
Buzzer signal selection bits(fx=4.19 MHz):
00 = 0.5 kHz
01 = 1 kHz
10 = 2 kHz
11 = 4 kHz
Watch timer Enable/Disable bit:
0 = Disable watch timer;
clear frequency dividing circuits
1 = Enable watch timer
Watch timer speed selection bits(fx=4.19 MHz):
00 = Set watch timer interrupt to 1 s
01 = Set watch timer interrupt to 0.5 s
10 = Set watch timer interrupt to 0.25 s
11 = Set watch timer interrupt to 3.91 ms
Figure 14-1. Watch Timer Control Register (WTCON)
14-2